WO2012144108A1 - Procédé de réception optique et récepteur optique - Google Patents

Procédé de réception optique et récepteur optique Download PDF

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Publication number
WO2012144108A1
WO2012144108A1 PCT/JP2011/079115 JP2011079115W WO2012144108A1 WO 2012144108 A1 WO2012144108 A1 WO 2012144108A1 JP 2011079115 W JP2011079115 W JP 2011079115W WO 2012144108 A1 WO2012144108 A1 WO 2012144108A1
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WO
WIPO (PCT)
Prior art keywords
optical signal
optical
phase
ratio
compensation amount
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PCT/JP2011/079115
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English (en)
Japanese (ja)
Inventor
一臣 遠藤
陽一 橋本
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日本電気株式会社
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Publication date
Application filed by 日本電気株式会社 filed Critical 日本電気株式会社
Priority to JP2013510847A priority Critical patent/JPWO2012144108A1/ja
Priority to US14/112,653 priority patent/US9154232B2/en
Publication of WO2012144108A1 publication Critical patent/WO2012144108A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/60—Receivers
    • H04B10/61—Coherent receivers
    • H04B10/616—Details of the electronic signal processing in coherent optical receivers
    • H04B10/6165—Estimation of the phase of the received optical signal, phase error estimation or phase error correction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/60—Receivers
    • H04B10/61—Coherent receivers
    • H04B10/614—Coherent receivers comprising one or more polarization beam splitters, e.g. polarization multiplexed [PolMux] X-PSK coherent receivers, polarization diversity heterodyne coherent receivers

Definitions

  • the present invention relates to an optical receiving method and an optical receiver.
  • Non-Patent Document 1 a polarization diversity reception system whose reception sensitivity does not depend on the polarization state as disclosed in Non-Patent Document 1 is disclosed.
  • the polarization beam splitter separates the multi-level modulated optical signal into two orthogonally polarized optical signals.
  • the 90 ° hybrid mixes each separated optical signal with local light and outputs optical signals corresponding to the in-phase component and the quadrature component, respectively.
  • the photodiode converts each 90 ° hybrid output optical signal into an electrical signal.
  • reception sensitivity change correction based on the polarization state of an input signal is realized by digital signal processing.
  • Non-Patent Document 1 uses a maximum ratio combining method (MRC) as digital signal processing for correcting a change in reception sensitivity due to a polarization state of an input signal.
  • MRC maximum ratio combining method
  • the power ratio ⁇ and the phase difference ⁇ of the output signals Ex and Ey of each 90 ° hybrid are obtained.
  • the original optical modulation signal Es is reproduced by executing the maximum ratio combining as shown in the following (Equation 1).
  • j represents a pure imaginary number.
  • the first item and the second item Is a term that is corrected to maximize the output power.
  • e -j ⁇ the first item represents a term for correcting the phase difference between E y and E x.
  • An object of the present invention is to provide an optical reception method and an optical receiver in which reception sensitivity does not depend on a polarization state in reception of a multilevel phase optical signal.
  • the optical receiving method of the present invention separates a single-polarized multi-level optical signal into a first optical signal and a second optical signal whose polarizations are orthogonal to each other, and the power of the first optical signal A power ratio of the second optical signal is calculated, a difference between the phase of the first optical signal and the phase of the second optical signal is calculated as a compensation amount, and the difference is calculated based on the ratio and the compensation amount.
  • the first optical signal and the second optical signal are combined by a maximum ratio combining method, and the compensation amount is changed based on the ratio.
  • the optical receiver of the present invention includes a means for separating a single-polarized multilevel optical signal into a first optical signal and a second optical signal whose polarizations are orthogonal to each other, and the power of the first optical signal And a power ratio of the second optical signal, a means for calculating a difference between the phase of the first optical signal and the phase of the second optical signal as a compensation amount, and the ratio and the compensation amount And means for combining the first optical signal and the second optical signal by a maximum ratio combining method, and changing the compensation amount based on the ratio.
  • FIG. 3 is a block diagram illustrating a configuration example of a polarization regeneration unit that configures the signal light reception unit illustrated in FIG. 2.
  • 4 is a flowchart illustrating an operation example of a polarization recovery unit illustrated in FIG. 3.
  • FIG. 6 is a flowchart illustrating an operation example of a polarization recovery unit illustrated in FIG. 5.
  • FIG. 1 is a block diagram illustrating a configuration example of a coherent optical receiver according to the first embodiment of the present invention.
  • This coherent optical receiver includes a polarization beam splitter 1, a local oscillation light generation unit 2, and an optical reception unit 3.
  • the polarization beam splitter 1 converts a multilevel modulated optical signal (or also referred to as a single polarization multilevel phase optical signal) from an optical transmission line into an optical signal X (first optical signal) whose polarizations are orthogonal to each other.
  • the optical signal is separated into an optical signal Y (second optical signal).
  • the local oscillation light generation unit 2 is, for example, a distributed feedback laser diode, and outputs continuous light (hereinafter referred to as local light).
  • the signal light receiving unit 3 uses the local light generated by the local oscillation light generating unit 2 and performs coherent detection (for example, homodyne detection or heterodyne detection) on the optical signals X and Y to convert them into baseband signals X and Y. Further, the signal light receiving unit 3 reproduces the transmitted multilevel modulated optical signal from the baseband signals X and Y and performs demodulation processing.
  • FIG. 2 is a block diagram illustrating a configuration example of the signal light receiving unit 3.
  • the signal light receiving unit 3 includes 90 ° hybrids 4 and 5, photoelectric conversion units 6, 7, 8 and 9, a polarization regeneration unit 10, and a demodulation processing unit 11.
  • the 90 ° hybrid 4 receives the optical signal X and the local light, and outputs optical signals corresponding to the in-phase component and the quadrature component, respectively.
  • Photoelectric conversion unit 6 outputs the in-phase baseband signals X I receives the optical signal corresponding to the phase component of the optical signal X.
  • Photoelectric conversion unit 7 receives the optical signal corresponding to the quadrature component of the optical signal X and outputs the quadrature baseband signal X Q.
  • the 90 ° hybrid 5 receives the optical signal Y and the local light, and outputs optical signals corresponding to the in-phase component and the quadrature component, respectively.
  • Photoelectric conversion unit 8 outputs the in-phase baseband signals Y I receive optical signals corresponding to the in-phase component of the optical signal Y.
  • the photoelectric conversion unit 9 receives an optical signal corresponding to the orthogonal component of the optical signal Y and outputs an orthogonal baseband signal YQ .
  • the polarization recovery unit 10 receives the baseband signals X I , X Q , Y I , and Y Q from the photoelectric conversion units 6, 7, 8, and 9.
  • the polarization recovery unit 10 obtains the power ratio ⁇ and the phase difference ⁇ between the optical signal Y and the optical signal X branched by the polarization beam splitter 1 of FIG. 1 based on the signal components included in each.
  • the phase difference means a phase difference between two waves (optical signal Y and optical signal X).
  • FIG. 3 is a block diagram illustrating a configuration example of the polarization recovery unit 10.
  • the polarization recovery unit 10 includes a coefficient calculation unit 12, a polarization recovery processing unit 13, and a phase recovery processing unit 14.
  • the coefficient calculation unit 12 obtains a power ratio ⁇ and a phase difference ⁇ between the optical signal Y and the optical signal X based on each baseband signal X I , X Q , Y I , Y Q.
  • the polarization regeneration processing unit 13 calculates the in-phase baseband signal E I 'and the quadrature baseband signal E Q ' based on the obtained power ratio ⁇ and phase difference ⁇ .
  • the phase regeneration processing unit 14 outputs an in-phase baseband signal E I and a quadrature baseband signal E Q compensated for a phase offset caused by a difference in center frequency between signal light and local light and a difference in line width.
  • FIG. 4 is a flowchart showing an operation example of the polarization recovery unit 10 shown in FIG.
  • the coefficient calculation unit 12 obtains complex amplitude ratios r and ir of E x and E y using the following (Equation 2) and (Equation 3), respectively (Ste S1).
  • E x is a complex number represented by X I + jX Q.
  • E y is a complex number represented by Y I + jY Q.
  • j represents a pure imaginary number.
  • the coefficient calculation unit 12 calculates the average of the complex number amplitude ratios r and ir (step S2).
  • examples of the average include an additive average or a multiplicative average.
  • the coefficient calculation unit 12 compares the magnitude relationship between the absolute value
  • the complex amplitude ratios r and ir can be expressed as the following (Equation 4) and (Equation 5), respectively, by the power ratio ⁇ and the phase difference ⁇ .
  • 2 +1) and ⁇ arg (r).
  • 2 +1) and ⁇ ⁇ arg (ir). Based on the power ratio ⁇ and the phase difference ⁇ obtained by the coefficient calculation unit 12, the polarization regeneration processing unit 13 obtains the complex signal E s ′ by the maximum ratio combining method of the algorithm as shown in the following (Equation 6). (Step S6).
  • the polarization regeneration processing unit 13 outputs the real part and the imaginary part of the complex signal E s ′ as an in-phase baseband signal E I ′ and a quadrature baseband signal E Q ′, respectively.
  • the phase regeneration processing unit 14 outputs the baseband signal E s ′ rotated by ⁇ (1- ⁇ ) ⁇ as compared with the optical transmission signal and outputs the feed forward M-th power algorithm or the decision-directed phase-locked loop. It correct
  • the phase rotation is caused by the phase noise of the local light in the optical synchronous detection or the relative frequency fluctuation between the local light and the transmission side optical signal.
  • the phase noise and the frequency fluctuation can be compensated simultaneously. it can.
  • the phase difference correction terms (e ⁇ j (1 ⁇ ) ⁇ and e j ⁇ ) in (Expression 6) are the first.
  • the second term becomes more dominant than the term.
  • the phase difference correction term is more dominant than the second term.
  • step S2 in FIG. 4 is not necessarily required. Further, an average (additive average or multiplicative average) of the power ratio ⁇ and the phase difference ⁇ may be taken.
  • the polarization reproduction processing unit 13 shown in FIG. 3 outputs a signal rotated by ⁇ (1 ⁇ ) ⁇ as compared with the optical transmission signal. (A signal obtained by compensating the phase of the synthesized signal by the compensation amount after the change) is output.
  • frequency compensation processing and phase compensation processing are performed.
  • the symbol is erroneously recognized in such a process.
  • the present embodiment is for solving this problem.
  • the coherent optical receiver according to the second embodiment of the present invention will be described below.
  • the basic configuration of this coherent optical receiver is the same as the basic configuration of the first embodiment shown in FIG.
  • the configuration of the signal light receiving unit constituting the coherent optical receiver is the same as that of the signal light receiving unit 3 of the first embodiment shown in FIG. Therefore, these descriptions are omitted.
  • the difference of the second embodiment from the first embodiment is that the configuration of the polarization reproducing section that constitutes the signal light receiving section is different.
  • FIG. 5 is a block diagram illustrating a configuration example of a polarization recovery unit included in the coherent optical receiver according to the second embodiment of the present invention. Compared to the polarization recovery unit (see FIG.
  • the polarization recovery unit shown in FIG. 5 further includes a phase determination unit 15 and a phase rotation unit 16.
  • the phase determination unit 15 determines whether or not the phase difference ⁇ is random. Based on the power ratio ⁇ or the phase difference ⁇ received from the coefficient calculation unit 12, the phase determination unit 15 determines whether or not the phase of the synthesized signal is to be compensated by the compensation amount after the change, and the determination result is the phase. Output to the rotating unit 16. Based on the determination result, the phase rotation unit 16 performs an operation of rotating the output baseband signal Es ′ by (1 ⁇ ) ⁇ by rotating it by ⁇ (1 ⁇ ) ⁇ compared to the optical transmission signal.
  • FIG. 6 is a flowchart showing an operation example of the polarization recovery unit shown in FIG.
  • the phase determination unit 15 receives the power ratio ⁇ or the phase difference ⁇ from the coefficient calculation unit 12 (step S10).
  • the phase determination unit 15 determines whether or not the phase difference ⁇ is random (step S11).
  • the phase determination unit 15 outputs the determination result to the phase rotation unit 16.
  • the phase rotation unit 16 determines whether or not the input determination result is a result indicating that the phase difference ⁇ is random (step S12).
  • the phase rotation unit 16 When the phase difference ⁇ is random (No in step S12), the phase rotation unit 16 directly uses the output E s ′ (that is, the signal rotated by ⁇ (1- ⁇ ) ⁇ ) as it is. Output to the subsequent stage (phase reproduction processing unit 14).
  • the phase rotation unit 16 rotates and outputs the output E s ′ of the polarization regeneration processing unit 13 by (1- ⁇ ) ⁇ (Step S14).
  • the phase rotation unit 16 rotates and outputs the output E s ′ of the polarization regeneration processing unit 13 by (1 ⁇ ) ⁇ . .
  • the phase determining unit 15 can make the above determination using the phase difference ⁇ .
  • t represents time.
  • Dth is a predetermined difference threshold value.
  • Dth is a predetermined difference threshold value.
  • the threshold value Dth and the threshold value exceeding count k can be arbitrarily set. The phase difference can be determined sequentially or periodically according to a certain time schedule.
  • FIG. 7 is a block diagram illustrating a configuration example of the optical receiver 100 according to the third embodiment of the present invention.
  • the optical receiver 100 includes a separating unit 101, a calculating unit 102, and a combining unit 103.
  • Separating means 101 separates a single-polarized multilevel phase optical signal into a first optical signal and a second optical signal whose polarizations are orthogonal to each other.
  • the calculating means 102 calculates the ratio between the power of the first optical signal and the power of the second optical signal and the difference between the phase of the first optical signal and the phase of the second optical signal as a compensation amount.
  • the combining unit 103 combines the first optical signal and the second optical signal by the maximum ratio combining method based on the ratio and the compensation amount.
  • the synthesizing unit 103 changes the compensation amount based on the ratio. According to the third embodiment described above, it is possible to receive multi-level phase optical signals whose reception sensitivity does not depend on the polarization state.
  • the first to third embodiments described above can also be embodied as predetermined hardware, for example, a circuit. Further, the first to third embodiments described above can be controlled and operated by a computer circuit (for example, a CPU (Central Processing Unit)) (not shown) based on a control program. In this case, these control programs are stored in, for example, a storage medium inside the optical receiver or an external storage medium, and are read out and executed by the computer circuit. Examples of the internal storage medium include a ROM (Read Only Memory) and a hard disk. Moreover, examples of the external storage medium include a removable medium and a removable disk.
  • a computer circuit for example, a CPU (Central Processing Unit)
  • these control programs are stored in, for example, a storage medium inside the optical receiver or an external storage medium, and are read out and executed by the computer circuit. Examples of the internal storage medium include a ROM (Read Only Memory) and a hard disk.
  • examples of the external storage medium include a removable medium and a removable disk.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)

Abstract

Afin de permettre la réception dans laquelle la sensibilité de réception ne dépend pas de l'état de polarisation dans la réception d'un signal optique en phase M-aire, dans le procédé de réception optique, un signal optique en phase M-aire d'une seule polarisation est séparé en un premier signal optique et un deuxième signal optique de polarisations mutuellement orthogonales, le ratio de la puissance du premier signal optique sur la puissance du second signal optique est calculé, et la différence entre la phase du premier signal optique et la phase du second signal optique est calculée comme une quantité de compensation, où, sur la base du ratio et de la quantité de compensation, le premier signal optique et le second signal optique sont combinés au moyen d'un procédé de combinaison de ratio maximal, et la quantité de compensation est modifiée sur la base du ratio.
PCT/JP2011/079115 2011-04-21 2011-12-09 Procédé de réception optique et récepteur optique WO2012144108A1 (fr)

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US14/112,653 US9154232B2 (en) 2011-04-21 2011-12-09 Optical reception method and optical receiver using maximal-ratio-combining method

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WO2014146236A1 (fr) * 2013-03-18 2014-09-25 华为技术有限公司 Dispositif et procédé de communication optique cohérente
US9967028B2 (en) 2014-10-22 2018-05-08 Indian Institute Of Technology Delhi System and a method for free space optical communications

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US9154232B2 (en) 2015-10-06
US20140044440A1 (en) 2014-02-13

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